So far, the only (semi-)serious bugs I've encountered have been from the vanilla game. The restored content itself appears to be working well and is, overall, pretty nicely integrated into the game — in many cases, you don't even notice it's there; it's just that some loose ends from the vanilla game are now sorted out.

There are a few instances of somewhat awkward intercuts, or the screen fading in and out unnecessarily before or after the new content, but nothing to seriously detract from the experience so far.